Navicula diversa Greville; Navicula weissflogii Schmidt
Allen and Cupp, 1935: p. 155, Fig. 100 (as Navicula weissflogii); Hendey, 1970: p. 141;Witkowski et al., 2000: p. 197, Pl. 92: 4, 5; 94: 12, 13.
Valves linear-elliptic in outline with relatively deeply constricted valve margins and broadly rounded apices, 27-110 µm long; 11-35 µm broad (7-25 µm broad in the middle). Central nodule small, apically elongated, raphe sternum furrows close together and parallel, longitudinal canals linear, slightly convex toward the valve margins; transapical striae robust, slightly radiate, 7-8 in 10 µm; crossed by straight or slightly wavy longitudinal ribs (Witkowski et al., 2000).
Cells length 35-41 µm; width 17-19 µm.
Mainly littoral species, but is frequently found in the plankton.
Sites of occurrence in RSA:
In Winter 2006 Cruise, this species was observed at various sites (refer sites map), usually in small numbers; however, it was quite abundant at some localities; maximum abundance (3.4*10^3 cells/l) was associated with the northwestern part of the inner RSA (St. 25). Species has been previously reported from Kuwaiti shore (Hendey, 1970) and coastal waters (AlYamani et al., 2004; Al-Kandari et al., 2009).